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Old 05-08-2019, 03:56 PM   #40
wparsons
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The SAE quote is about N/A engines, and has already been addressed by the OEM tuning of the stock engine. Unless you're running at tiny turbo, it won't be an issue. Even worse, the bigger risk of boost down low is bent rods (see high boost from twin screw supercharger issues).

At the end of the day, higher compression ratio is better for thermal and volumetric efficiency, which does help fuel economy, but also power output. Less thermal and volumetric efficiency means it takes more extra boost than the lower c/r to make the same power. That means higher peak cylinder pressures for the same hp output than the high c/r lower boost setup.
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